Flywheel magneto



'Jan' 4 1927' w. w. HAwKlNs 1613033.

mman uAGNETo Filed Feb. zo, '1922' 4 Sheets-slaapt 1 N SQ h Jan.

4 1927 w. w. HAwKlNs FLYWHEEL MAGNETO Filed Feb. 20, 1922 4 Sheets-Sheet2 a 4 1927 w. w. HAwKlNs FLYWHEEL MAGNETO Filed Feb. 20, 1922 4Sheets-Sheet 4 Pemba im. 4,1921.

` UNITED sTATEs PATENT OFFICE.

WILLIAI W. nwm, OF'BBOOKLYI, NEW YORK, ABSIGND T0 WEBSTER ELECTRICQOIPANY, 0l' BAGUE, mlm, A OOEPOBLTION' 0F YIBGE'SIN.v

FLYWREEL IAGNETO.

Application Iled February 20, im. Serial le. 587,991.

This invention relates to ma netos of the type in which the rotary ele'ent ofthe magneto is carried on theffly wheel of the engine or motor.

The objectofthe invention is the rovision of a device of this characterwich will have no delicate or, adjustable parts carried on the fiy wheel,and in\which the danger o f the parts of the device getting out ofadjustment s reduced to the minimum.

One of the features of the ,invention resides in the provision of innerand .outer rotor elements Vbetween the paths of movement of which therelatively stationary elements of the magneto are arranged.

Another feature of the invention resides in the provision of anadjustable mounting member u n which is sup 'rted the rela'- tivelystatlon'ary elementso the m eto.

A further feature, and one relat to the one last referred to,'is thearrangement-on the adjustable but relatively stationary mountingA memberofthe interru ter and also a pei/)rtion of the distributor, t ese.elements in g so arranged that when the device is ad]usted to advanceor retard the o ,eration'of theinterrupter, the distributor e ements arecorres ndmgly adjusted. A still further. eatureresides in. thearrangement of parts so that the act of adjustingthe time ofoperation'of the interyrupter automaticall acts to similarly. adjust thetime'of reversaof the magnetic lines in the coil core. 7

Other features of the .invention will appear as the description oftheinvention progresses.

In the drawings- Figure 1 is a' sectional view on the yline 1--1 ofFigure 2, looking in the direction of thearrows; y. Figure 2 is asection on the line 2-'2 of Figure 1, looking in thedirection of thearrows; Figure 3 device seen Figa 4-4 of Figure 2;

Figure 5 is a view of the device 'as viewed frin the left in Figure 1the evice, showing a in i'ied form of transformer coils;

'Figure 7 is a schematic diagram indicat is a view yof the portion ofthe from .the line 3-3 of Figure 2;

re 4 is a sectional view on'the line re 6 is a section thiou h a portionof Figure 8 1s a view on the line 8-8 of Fi re 5;'

-igure 9 is a section on the line. 9-9 of F' re 5;

igure 4v10 is a circuit diagram of the arment shown in Figure 2; igure11 is a sectional view through the device adjacent to the interrupterplate'as on Fthe line 11-11 of Figure 2 1- of Figure v2;

Figure 13 1s a section ron the line 13-13 of Figure 11; and

Figure 14 is a perspective view of an insulatmg collar forming part ofthe distributor.

The present arrangement is'particularly designed for a two cylinder, twocycle engine, so in reading the following description, 1t should beborne in mind that the device is arrangedto send an impulse of hightension current to each of the two 'spark plugs re 12 'is a section onthi-I line 12-12 once for each revolution, of the motor shaft.

Referring now to the drawings, 1 re resents the bearing `housing for themain s aft -2 of the engine or motor.

bearing carried by the housing 1. Secured to the end. of the shaft .2by'means of thel spline or keyy 4 and the nut 5 is a fly wheel 6provided with the annular iange 7. Mounted on' the fly wheel atdiametrically opposite sides thereof, and adjacent to the flange 7, arethe inductors 8 and 9, each of which consists ofa plurality of strips orlaminations secured to the iiy wheel by means of the screws 12 and 13.

` Non-rotatably secured on the shaftv2 by symmetrically and thelammations or plates are secured screws or rivets 22.

Secured to one side of thehub 15, as by means ofthe screws 2,3, is thecam plate 24,

stationary portion of the magneto..

and 21. The 'inductors 18, 19, 20 and 21 are arranged about the hub 15,

between the flanges 16 and 17 by meansof- 3 indicates the which isprovided on its diametrically opposite edges with the cam projections 25and 26. Secured to the hub 15, but on the side opposite to the plate 24,is the distributor block 27 of any desired insulating material. Block 27may be secured to the hub 15 in any desired manner, such as by means ofscrews'28.

Tt will be noted that between the flange 7 of the ily wheel and theinductors 8 and 9 adjacent thereto on one side and the assembly carriedby the hub 15 on the other, there is an annular depression or space. Therelatively stationary portion of the magneto is arranged to project intoand occupy the major portion of this annular space between the outer andinner rotor elements or inductors. Adjustably mounted on the outwardlextending portion of the bearing 3 is the hull)I 29. Secured to orintegral with the hub 29 is the supporting frame work of the relativelystationary elements'of the magneto, shown in section in Figure 2. Thissupporting frame work is preferably made as a casting of brass or othernon-magnetic material.

Secured to the outwardly extending fiange 30 of the mounting plate. asby means of the bracket clips 3l, 32 and 33, is a permanent magnet 34provided with the laminated pole pieces 35 and 36. The clips 31, 32 Aand33 are secured to the mounting member by means of screws 37, 38 and 39.The laminations forming the pole pieces 35 land 36 are secured inposition by means of the screws 40 and 41, which pass through thelaminations and are received by the mounting plate of the relativelystationary members. i

Secured to the flanges 42 and 43 of the mounting plate, as by means ofthe rivets 44 and 45, are the hollow rectangular laminations 46 whichform the hollow rectangular core 47 for the magneto coils. About one leg48 of the core 47 are woundthe primary coil 49 and the secondary coil50. About the other leg 51 of the core 47 is wound the tertiary coil 52.The connections for these coils is schematically indicated in Figure 10.Adjacent to the opposite vends of the coils are the heads 53 and 54 ofliber board or other insulating material.

The distributor block 27 is provided with 'an annular channel 55 atthebottom of which is fixed the annular ring 56 of brass or othersuitable material. p Threaded into a shoulder 57 of the mounting platefor the relativelyy stationar37 magneto elements is a sleeve or collar58 of .insulating material. Slidably mounted within the collar 58 is theconducting brush 59, the outwardly extending end of which is arranged toengage the distributor ring 56.. Threaded within the outer end of thecollar 58 is a contact element 60 to which is secured one end of' theconductor 61, the other end being connected Vto the high tension orsecondary coil 50. A spring 62 acts to maintain tlze brush or wiper 59in engagement with the ring 56, and also electrically connects the brushto the contact element 60. i

Between the plates 53'and 54 and at the side of the high tension windingis a plate 63 of fiber board or other suitable insulating material whichmay be secured between the plates 53 and 54 by means ot brads 64, or inany other desired manner. Mounted on the plate 63 is a conductingcontact 65 which is electrically connected to the output side of thehigh tension coil 50.

Mounted about the high tension coil is the cover 66 of any suitableinsulating material. This cover is provided on its inner surface withthe conducting contact 67 which, when the cover is in place, is arrangedto engage the contact 65 electrically joined to the high tension coil50. The end oi' the conductor 61 remote from the contact Yis joined tothe contact 67. Thus it Will be seen that at all times the output end ofthe high tension coil 50 is electrically connected to the distributorring 56. The cover plate 66 at one edge thereof is arranged to projectslightly into the depression 68 formed in the shoulder 57. The oppositeedge is secured down by means of the spring hook 69 which 1s plvotallyjoined at 70 to the tanve 71 of the supporting plate for the relativelystationary elements of the magneto.

It will be noted that the channel 55 and the distributor ring 56 aremounted outside of and immediately adjacent to the hub 29 of the.relatively stationary mounting plate. Surrounding the distributor ring56 and the annular groove 55, but secured to the stationary mountingplate is a ring of insulat- 10# ing material 72 which may be ofshellacked paper, fiber board, or other suitable material. MountedWithin the wall 73 of the stationary mounting plate, as by screwthreaded arrangement, are the contact 'supporting 110 blocks 74 ofinsulating material. These blocks are on diametrically opposite sides.Withineach block 74 is a contact element 75 from which extends theconductor 76 leading to a spark plug.

The insulating ring 72 is provided with diametrically opposite openings77 which arepositioned at the points of the contact elements 75. Securedto the distributor block, in any desired manner, is a contact 78 whichT3 is conductively joined to the distributor ring 56 by means of aconductor 79. It will thus be seen that during the operation of themotor, that is, while the shaft 2 is rotating, the contact 78 connectedto the distributor ring 125 56 will be brought adjacent to each of thecontacts 75 during each revolution of the shaft.

As previously described. the interrupter or cam plate 24 is fixed to thehub 15 of the 13 rotor and, therefore, rotates with the shaft 2. YPivotally supported on the relatively fixed mounting plate, as by thepivot pin 80, is the breaker or interrupter arm 81, provided at itsfree/end with the contact element 82 and on its inner surface,intermediate its'ends, with the projecting portion 83 arranged to beengaged by the cam projections and 26 on the cam plate 24. Theinterrupter arm 81 may be formed of stamped sheet metal having theupstanding side portions 84 and 85 between which the projection orlug 83may bel secured bythe rivets 86. The fixed c ontact 87 of theinterrupter .is arranged to co-operate with the movable contact 82.Contact 87 is joined by means of the conductor 88 to the condenser 89which is mounted between the bracket members 90 fixed to the relativelystationary mounting plate.

The relatively stationary mounting plate is provided at one side withthe hand piece 91 by means of which the mounting. plate may be adjustedabout the bearing 3. The mounting plate is also provided with the springcatch 92 arranged to maintain the mounting plate in its adjustedposition, A plurality of notches 93 may be provided to co-operate withthe spring catch or retaining vmember 92. A series of notches 93 may belprovided so as to` ermit the operator to make any desiredda justment ofthe mountingplate or, if preferred, but three notches need be provided,one for the starting posi` tion, one for the high speed ahead position,

and the third for the reverseposition of the mountin plate.

The wiring of the device is schematically indicated in Figure 10. Itywill be noted that the primary winding 49 and the tertiary winding 52are connected in paralleland the adjacent ends of these coils, as wellas one end oi the high tension coil 50, is connected to round or to theframe of the motor, the ot 1er ends of the coils 49 and 52 beingconnected together and to the conductor 88 which joins the fixedinterrupter contact 87 to the condenser 89. The movable interruptercontact 82 is connected 'directly to ground.

In Figures 6 and 7, a modification of thel device is shown lin which thetertiary winding is omitted. In this modification, the hol-v lowrectangular core .piece is omitted and the core piece 94 is substituted.The pri-y marycoil 95 and the secondary or high tension coil 96 arewound about the core' 94 in much the same manner as the coils 49 andlows:

Assuming that the parts are 1n the relative positions indicated inFigure 1, and thatl the pole 35 of the magnet is the positive pole, themagnetic lines of force will extend from the magnet y34 through the poleieee 35, the laminations 8, up throu h the aminations 46, through thelaminations 20, pole piece 36 and to the other pole of the magnet 34.Assuming that the balance wheel is rotating in a clockwise direction, asviewed in Figure 1, it will be noted that an instant later thelaminations 8 will be moved to a position-such that they will bridge thegap between the laminations 46 and the core piece 36. At the same timethe laminations 21 will have been moved to a positionv to bridge the gapbetween the opposite ends of the laminations 46 and the core 35. We willnow nd that the magnetic lines`will extend from the core laminatiohs 46of the core 47 in the opposite direction. The path will now be from theright lleg of the magnet 34,v through the pole piece 35, laminations 21,laminations 46, laminations 8, pole piece 36 to the opposite leg of themagnet 34. A

Due to this quick reversal in the. direction -of the magnetic lines offorce extending through the laminations 46, current will be set up inthe coils 49 and 52 in parallel. The path of the current will extendfrom ground through the coils 49 and 52 in parallel through the contacts87 and 82 directly to ground. At this inst-ant, due to the action of theinterrupter, the contact 82 is separated from 'the contact 87, and theldirect path to ground is interrupted. The current flow now existing inthe coil 52 will act to oppose the current in the coil 49, causing thecurrent in primary coil 49 to quickly die down, thus creating in thesecondary coil a high potential impulse. At this instant the contact 78joined to the distributor ring 56 is adjacent to one of the relativelyfixed contacts 75 which is joined to the spark plug, and a highpotential impulse will be transmitted to the spark plug, causing it tofire the charge Within the cylinder of the motor.

The present magneto arrangement has vbeen particularly designed vfor usewith a two cylinder tWo cycle engine, and it will be noted that theoperation, which has been above described, will take place twice foreach revolution of the shaft 2. However, it' is apparent thatmodifications may be read- \ily made in the design of this apparatus soIas to adapt it for use with motors of other characters.

'The modification shown in Figure 6 will operate in much the same manneras that above described, except that the tertiary coil is omitted andwill not operate to o pose the current flowing in the primary coi Due tothe peculiar construction described, if `the interrupter is moved aroundto change the time of the break, the pole pieces 35 and 36 are similarlyadjusted so the reversal of direction of the magnetic lines in the core47 takes place in the same relative relation lao to the opening of theinterrupter contacts regardless of the adjustment of the mounting plate.(Not only this, but the contacts 75 are also adjusted so that,regardless of the position to which the. mounting plate is adjusted, oneor the other is always` immediately opposite the contact 78 each timethe interrupter contacts are opened. Vith the present arrangement, it isimpossible for the parts to get out ot' adjustment relative to each ot'the others. 'lhe only adjustment to make is the time of the operation ofthe :interrupter contacts, and the other' adjustments followautomatically in making the interrupter adjustment.

lrVhile in the accompanying drawings and specification, the disclosureof the invention has been limited substantially to one detailedarrangement ot parts, it is to be understood that various modificationsof therinvention are contemplated, and that the invention is to helimited merely hy the scope of the appended claims.

Vhat I claim is:

1. In a magneto, a fly wheel, an outer inductor rotatable with said flywheel adjacent to the circumference thereof, an inner inductor rotatablewith said fly wheel adjacent to the axis of said wheel, a normallystationary core mounted between the paths of said outer and innerinductors, a magnet associated with said core, and a coil on said core.

2. In a. magneto, a fly wheel, an outer in- Aductor onsaid fly Wheeladjacent to the circumference thereof, inner inductors on said fly wheeladjacent to the axis thereof, a magnet and a core mounted in the spacebetween the aths of rotation of said outer and inner in uctors, and acoil on said core.

3. In a magneto, a fly wheel, outer inductors on said fly Wheel adjacentto the circumference thereof, inner inductors on said wheel adjacent tothe axis of rotation thereof, a normally stationary core mountedVbetween the paths of rotation on said outer and inner inductor-s, amagnet associated with said core, a coil on said core, and means foradjusting the position of said core.

4. In a magneto, a fly wheel, outer inductor-s on said wheel adjacent tothe circumference thereof, inner inductols on said wheel adjacent to theaxis of rotation of said wheel, a magnet, its pole pieces, and a coremounted in the space between the paths of rotation of said outer andinner inductors, a coil on said core, and means for adjusting theposition of said magnet, pole pieces and core. f

'5. In a magneto, a shaft, a rotatable element thereon, an inductorelement on said rotatable element remote from said shaft, anotherinductor element on said rotatable element adjacent to said shaft, acore arranged between the paths of saidl inductor elements. a magnetassociated'with said core, and a coil on said core.

6. In a magneto, a hollow rectangular core, a primary coil on one leg ofsaid core, a tertiary coil about another legr of said core, a secondarycoil in inductive relation to said primary coil, and interruptercontacts, said primary and tertiary coils being in parallel relationwhen said contacts are closed, and in opposed series relation when saidcontacts are open.

In witness whereof, I hereunto subscribe my name this 27th da ofJanuary, 1922.

WILLIAI W. HAWKIN S.

